Which of the following files can be used to modify PHP configurations?

httpd_php.conf

isset.ini

php.ini

config.ini

Explanation:The php.ini file is a configuration file in PHP that is used to customize behavior of PHP at runtime. It can customize various settings such as upload directory, register global variables, display errors, log errors, max uploading size setting, and maximum time to execute a script and other configurations. According to php.net, php.ini can be searched in the following locations:

As of PHP 5.2.0, the location of the php.ini file can be set for different versions of PHP. The following registry keys are examined in order: [HKEY_LOCAL_MACHINE\SOFTWARE\PHP\x.y.z], [HKEY_LOCAL_MACHINE\SOFTWARE\PHP\x.y] and [HKEY_LOCAL_MACHINE\SOFTWARE\PHP\x], where x, y and z mean the PHP major, minor and release versions. If there is a value for IniFilePath in any of these keys, the first one found will be used as the location of the php.ini (Windows only).[HKEY_LOCAL_MACHINE\SOFTWARE\PHP], value of IniFilePath (Windows only).Current working directory (except CLI).

Answer options B, A, and D are incorrect. These are not valid file settings.